Here is one that compresses all whitespace down to a single space for readability based on Jest’s toEqual matcher. It will deal with tabs, newlines etc. It will give you pretty output like the included Jest matchers.
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import { replace, map, equals } from 'ramda'; import { matcherHint, printReceived, printExpected } from 'jest-matcher-utils'; import diff from 'jest-diff'; const replaceWhitespace = replace(/\s+/g, ` `); const compressWhitespace = map(replaceWhitespace); const name = `toEqualWithCompressedWhitespace`; export default (received, expected) => { const [ receivedWithCompresssedWhitespace, expectedWithCompresssedWhitespace, ] = compressWhitespace([received, expected]); const pass = equals( receivedWithCompresssedWhitespace, expectedWithCompresssedWhitespace ); const message = pass ? () => `${matcherHint(`.not.${name}`)}\n\n` + `Uncompressed expected value:\n` + ` ${printExpected(expected)}\n` + `Expected value with compressed whitespace to not equal:\n` + ` ${printExpected(expectedWithCompresssedWhitespace)}\n` + `Uncompressed received value:\n` + ` ${printReceived(received)}\n` + `Received value with compressed whitespace:\n` + ` ${printReceived(receivedWithCompresssedWhitespace)}` : () => { const diffString = diff( expectedWithCompresssedWhitespace, receivedWithCompresssedWhitespace, { expand: this.expand, } ); return ( `${matcherHint(`.${name}`)}\n\n` + `Uncompressed expected value:\n` + ` ${printExpected(expected)}\n` + `Expected value with compressed whitespace to equal:\n` + ` ${printExpected(expectedWithCompresssedWhitespace)}\n` + `Uncompressed received value:\n` + ` ${printReceived(received)}\n` + `Received value with compressed whitespace:\n` + ` ${printReceived(receivedWithCompresssedWhitespace)}${ diffString ? `\n\nDifference:\n\n${diffString}` : `` }` ); }; return { actual: received, expected, message, name, pass, }; }; |
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